This Saturday, Hollywood's biggest celebs descended on Washington, D.C. for the 98th annual White House Correspondents' Dinner. Jimmy Kimmel hosted the evening, and he and President Obama took to the stage to make fun of Hollywood, the government, and even roast some of the stars who were there that night!

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According to E! Online, the President began with a bit backstage, where he said made jokes like, "Why is [Kim Kardashian] famous, anyway?," "I'm like a five on the 'Just for Mens' scale," and "I literally have no idea what I'm saying tonight." He went on to poke fun at Donald Trump, Hillary Clinton, Mitt Romney, and Sarah Palin.

Jimmy made a Kim Kardashian joke of his own, quipping that next to Osama bin Laden, she's the "biggest threat to America." Of course, Lindsay Lohan wasn't spared, either. Jimmy asked pilot Sully Sullenberger, "Sully,will you do us a favor? Will you drive Lindsay Lohan home? Just make sure youdon't run into a goose, and make sure it isn't a grey goose."

At the end of his speech, Jimmy called out his former teacher Mr. Mills, who once told him he would "never amount to anything." "Well, Mr. Mills," Jimmy said, "I'm about to high five the President of the United States!" And he did -- check out the photo in our gallery above!

Dozens and dozens of Hollywood's most famous celebrities were at the event -- Reese Witherspoon and Anna Paquin showed off their baby bumps, Paul Rudd, Josh Hutcherson, and Daniel Radcliffe got all spiffed up in tuxedos, and Once Upon a Time stars Ginnifer Goodwin and Josh Dallas made their official debut as a real-life couple! The stars also hobnobbed with each other -- check out the unlikely pairings of Jesse Tyler Ferguson and Kim Kardashian, and Ryan Kwanten and Real Housewife of New Jersey Caroline Manzo in our gallery!

Who looked the best at this weekend's White House Correspondents' Dinner?

Photos courtesy of Getty